8
.
1 Low battery indication
The
Meter displays “
” in the
upper display to indicate the status
of low battery.
Replace
t
he batteries immediately. Never leave a weak or dead battery in the
Meter. Even leak-proof types can leak and damage the Meter.
For example,
8.2 Overrange indication
The Meter will display “
” in the lower display if
t
he TEST but
t
on will be
depressed when BNC o
f
the Meter is improperly connected to
either a cable to be
tested or Alliga
t
or Clip adaptor or when no cable is connected
t
o the Meter.
For example,
8. Special Features
Fig. 16
Fig. 17
Theoretically V.O.P can be calculated from the dielectric constant, but actual values
often differ slightly from the theoretical one. In an actual cable the dielectric may not
fill up the space between the conductors completely. This can cause the effect of
increasing V.O.P.
In twisted pair cables the V.O.P depends upon the pitch of the twist to some extent.
The tighter the pitch the more dielectric and the less air space so the V.O.P is
higher. For example, variation of V.O.P between pairs with CAT 5 is typically ± 2 %
because the different pairs
of CAT
5 are deliberately given staggered pitches
t
o
reduce crosstalk.
7. Theoretical and Actual V.O.P
22 23
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